Mesa sidewall effect on Bi-2212 intrinsic Josephson junction terahertz emitters*

Since the observation of coherent terahertz radiation from atomic scale stacks of intrinsic Josephson junctions (IJJs) in the anisotropic cuprate superconductor Bi₂Sr₂CaCu₂O_8+δ (Bi-2212) [L. Ozyuzer et al., Science vol. 318, p. 1291 (2007)], the Bi-2212 IJJ terahertz emitters have been developed as a promising terahertz source. In this study, we established microfabrication processes to control a sidewall angle of the Bi-2212 mesas to investigate the effect of inhomogeneous characteristic distribution on mutual synchronization among stacked IJJs. Also, we attached the conductive patches on the Bi-2212 mesa in order to alter the boundary conditions at the sidewall. In this talk, we will discuss the details of the fabrication process and experimental results.